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Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. $ (20.9) $ (67.9) $ 12.8
(Loss) before tax, U.S. 34.8 5.0 19.7
Income (loss) from operations before income taxes (27.0) 35.1 (38.0)
Current tax (benefit)/expense, Non-U.S. 4.7 2.7 10.3
Current tax (benefit)/expense, U.S. 14.8 5.8 8.9
Current tax (benefit)/expense, Total 26.5 8.5 19.3
Deferred tax (benefit), Non-U.S. (1.7) (2.9) (0.9)
Deferred tax (benefit), U.S. (102.9) 0.0 0.0
Deferred tax, Total (104.6) (3.2) (0.9)
Total tax expense/(benefit), Non-U.S. 3.0 (0.2) 9.4
Total tax expense/(benefit), U.S. (88.1) 5.8 8.9
Total tax expense/(benefit) (78.1) 5.3 18.4
Current tax expenses (benefit) related to prior year 14.8    
Base erosion and anti-abuse (BEAT) expense 2.3 6.1 4.3
U.S. operating subsidiaries      
Income Tax Examination [Line Items]      
Base erosion and anti-abuse (BEAT) expense 1.1    
Aspen U.K.      
Income Tax Examination [Line Items]      
Base erosion and anti-abuse (BEAT) expense 1.2    
Bermuda      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. (103.3) 22.9 (81.5)
Current tax (benefit)/expense, Non-U.S. 0.0 0.0 0.0
Deferred tax (benefit), Non-U.S. 0.0 0.0 0.0
Total tax expense/(benefit), Non-U.S. 0.0 0.0 0.0
U.K.      
Income Tax Examination [Line Items]      
(Loss) before tax, Non-U.S. 62.4 75.1 11.0
Current tax (benefit)/expense, Non-U.S. 7.0 0.0 0.1
Deferred tax (benefit), Non-U.S. 0.0 (0.3) 0.0
Total tax expense/(benefit), Non-U.S. $ 7.0 $ (0.3) $ 0.1